I have edited it to reflect what I take to be your meaning, which I hope I have correctly interpreted.
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Barrie EnglandAug 29 '12 at 9:48

2

I think intonation would convey the sincerity and generosity more than the content. You could say any of them in a nice way, or in an unpleasant way. This is why you hear comments like "It's not what he said, but the way he said it".
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Roaring FishAug 29 '12 at 10:00

4 Answers
4

I think intonation is all that really matters here. Any other difference is negligible.

However, if you want to improve the sentence, perhaps you could reword the "there are plenty of eggs" part, as it's not completely obvious what it implies. For example, does it mean: "you can make yourself an egg" or does it mean: "let me make you an egg". The latter may be somewhat more generous.

I argue this is because it is the most deferrential. The deference comes from the additional words used. Those additional words denote attention or consideration on the part of the speaker.

Even if you speak that sentence with utter snide, it is still the more-gentle of the three versions of the sentence.

However, some people may consider the added word (i.e. consideration) to be excessive, which may make for another form of awkwardness. At minimum the third sentence is probably the 'most formal'. In a non-formal content a formal statement can be interpreted as a subtle form of insincerity.